Math Forum: K-12 Problems, Puzzles, Tips & Tricks

The Math Forum

K-12 Math Problems, Puzzles, Tips & Tricks

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See also the Math Forum's Internet Mathematics Library list of math problems and puzzles on the Internet, and our Teacher2Teacher FAQ: Tricks for Learning Math.

Download an archive for local viewing of the following tips and tricks: Mac or Windows.

Calculation Tips

Doing Math in Your Head
	Beat the Calculator - BEATCALC! More than 600 mental calculation tricks from the BEATCALC mailing list

	Divisibility Rules for numbers 3-13 Why do these rules work?
	Multiplication Tips Hints for multiplying by 5, 9, and 11
	Another Multiplication Tip How to multiply two 2-digit numbers that share the same tens digit

Math Problems

Russian Math Olympiads
	St. Petersburg, Russia 20 problems from the Palace of Youth Creativity
	Vologda, Russia 28 problems for grades 5-11

Math Puzzles

rec.puzzles
	rec.puzzles An archive of questions and answers that may be of interest to puzzle enthusiasts
Number & Line Puzzles
	Number Puzzles 2012 Puzzle 2011 \| 2010 \| 2009 \| 2007 \| 2006 \| 2005 \| 2004 \| 2003 \| 2002 2001 \| 2000 \| 1999 \| 1998 \| 1997 \| 1996 \| Four 4's Puzzle
	Math Line Puzzles Join the dots \| Rosebush Puzzles \| M Puzzle \| Toothpick Puzzle

Exploring Facts, Uncovering Connections
	*Critical Thinking Puzzles* Brain teasers from Michael DiSpezio's book

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